Man I'm so sorry for your situation. It really really sucks.

Your gf sounds like she is in a state of mental health crisis, and that needs to be addressed. I don't know what can be done to get her help, but she needs it. As a part of her getting help, she will likely interface with a social worker, who will also be able to help resolve things.

It does sound like you're deep in the darkness too.

From the details of your post, I assume that mental healthcare would be hard to get due to lack of resources. If that's incorrect, then by all means, you should seek treatment for yourself too.

Poverty fucking sucks. Feeling like you can't make ends meet when you have the responsibility of a family is absolutely crushing. Have you taken advantage of the community resources that are around? Things like welfare, food stamps, WIC, etc?

It does sound like maybe it would be a good idea for your kids to spend some time with relatives if you have them, while you and your gf regroup. I strongly feel that your gf is not in the frame of mind to care for them on her own.

Having young kids around is fucking hard. Nobody likes to admit it because it gets in the way of all those perfect Facebook posts, but if we're being honest with ourselves, it's very very hard. Raising a young family on a seriously tight budget is enough to drive anyone to the edge.